c:/users/user/appdata/local/arduino15/packages/esp8266/tools/xtensa-lx106-elf-gcc/2.5.0-4-b40a506/bin/../lib/gcc/xtensa-lx106-elf/4.8.2/../../../../xtensa-lx106-elf/bin/ld.exe: sketch\WeatherStationDemo.ino.cpp.o: in function `drawProgress(OLEDDisplay*, int, String)':
C:\Users\user\Downloads\esp8266-weather-station-master\examples\WeatherStationDemo/WeatherStationDemo.ino:238: undefined reference to `OpenWeatherMapCurrent::updateCurrentById(OpenWeatherMapCurrentData*, String, String)'
c:/users/user/appdata/local/arduino15/packages/esp8266/tools/xtensa-lx106-elf-gcc/2.5.0-4-b40a506/bin/../lib/gcc/xtensa-lx106-elf/4.8.2/../../../../xtensa-lx106-elf/bin/ld.exe: sketch\WeatherStationDemo.ino.cpp.o:(.text._Z10updateDataP11OLEDDisplay+0x38): undefined reference to `OpenWeatherMapForecast::updateForecastsById(OpenWeatherMapForecastData*, String, String, unsigned char)'
c:/users/user/appdata/local/arduino15/packages/esp8266/tools/xtensa-lx106-elf-gcc/2.5.0-4-b40a506/bin/../lib/gcc/xtensa-lx106-elf/4.8.2/../../../../xtensa-lx106-elf/bin/ld.exe: sketch\WeatherStationDemo.ino.cpp.o: in function `updateData(OLEDDisplay*)':
C:\Users\user\Downloads\esp8266-weather-station-master\examples\WeatherStationDemo/WeatherStationDemo.ino:241: undefined reference to `OpenWeatherMapCurrent::updateCurrentById(OpenWeatherMapCurrentData*, String, String)'
c:/users/user/appdata/local/arduino15/packages/esp8266/tools/xtensa-lx106-elf-gcc/2.5.0-4-b40a506/bin/../lib/gcc/xtensa-lx106-elf/4.8.2/../../../../xtensa-lx106-elf/bin/ld.exe: sketch\WeatherStationDemo.ino.cpp.o: in function `updateData(OLEDDisplay*)':
sketch/OpenWeatherMapCurrent.h:93: undefined reference to `OpenWeatherMapForecast::updateForecastsById(OpenWeatherMapForecastData*, String, String, unsigned char)'
c:/users/user/appdata/local/arduino15/packages/esp8266/tools/xtensa-lx106-elf-gcc/2.5.0-4-b40a506/bin/../lib/gcc/xtensa-lx106-elf/4.8.2/../../../../xtensa-lx106-elf/bin/ld.exe: sketch\WeatherStationDemo.ino.cpp.o:(.text.startup._GLOBAL__sub_I_WIFI_SSID+0xbc): undefined reference to `OpenWeatherMapCurrent::OpenWeatherMapCurrent()'
c:/users/user/appdata/local/arduino15/packages/esp8266/tools/xtensa-lx106-elf-gcc/2.5.0-4-b40a506/bin/../lib/gcc/xtensa-lx106-elf/4.8.2/../../../../xtensa-lx106-elf/bin/ld.exe: sketch\WeatherStationDemo.ino.cpp.o:(.text.startup._GLOBAL__sub_I_WIFI_SSID+0xc0): undefined reference to `OpenWeatherMapForecast::OpenWeatherMapForecast()'
c:/users/user/appdata/local/arduino15/packages/esp8266/tools/xtensa-lx106-elf-gcc/2.5.0-4-b40a506/bin/../lib/gcc/xtensa-lx106-elf/4.8.2/../../../../xtensa-lx106-elf/bin/ld.exe: sketch\WeatherStationDemo.ino.cpp.o: in function `_GLOBAL__sub_I_WIFI_SSID':
C:\Users\user\Downloads\esp8266-weather-station-master\examples\WeatherStationDemo/WeatherStationDemo.ino:97: undefined reference to `OpenWeatherMapCurrent::OpenWeatherMapCurrent()'
c:/users/user/appdata/local/arduino15/packages/esp8266/tools/xtensa-lx106-elf-gcc/2.5.0-4-b40a506/bin/../lib/gcc/xtensa-lx106-elf/4.8.2/../../../../xtensa-lx106-elf/bin/ld.exe: C:\Users\user\Downloads\esp8266-weather-station-master\examples\WeatherStationDemo/WeatherStationDemo.ino:98: undefined reference to `OpenWeatherMapForecast::OpenWeatherMapForecast()'
c:/users/user/appdata/local/arduino15/packages/esp8266/tools/xtensa-lx106-elf-gcc/2.5.0-4-b40a506/bin/../lib/gcc/xtensa-lx106-elf/4.8.2/../../../../xtensa-lx106-elf/bin/ld.exe: C:\Users\user\Downloads\esp8266-weather-station-master\examples\WeatherStationDemo/WeatherStationDemo.ino:98: undefined reference to `vtable for OpenWeatherMapForecast'
c:/users/user/appdata/local/arduino15/packages/esp8266/tools/xtensa-lx106-elf-gcc/2.5.0-4-b40a506/bin/../lib/gcc/xtensa-lx106-elf/4.8.2/../../../../xtensa-lx106-elf/bin/ld.exe: C:\Users\user\Downloads\esp8266-weather-station-master\examples\WeatherStationDemo/WeatherStationDemo.ino:98: undefined reference to `vtable for OpenWeatherMapCurrent'
collect2.exe: error: ld returned 1 exit status
exit status 1
Error compiling for board NodeMCU 1.0 (ESP-12E Module).
Hello,
Fresh IDE installation, followed the steps described here: https://docs.thingpulse.com/how-tos/Arduino-IDE-for-ESP8266/
But getting this